Radiation Measurements最新文献

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Implementation and optimisation of cosmic veto system using digital electronics in an environmental gamma-spectrometry laboratory 在环境伽马能谱仪实验室利用数字电子技术实施和优化宇宙否决系统
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-20 DOI: 10.1016/j.radmeas.2024.107302
Luka Bakrač , Tomislav Ilievski , Nikola Marković , Damir Bosnar , Ivana Tucaković
{"title":"Implementation and optimisation of cosmic veto system using digital electronics in an environmental gamma-spectrometry laboratory","authors":"Luka Bakrač ,&nbsp;Tomislav Ilievski ,&nbsp;Nikola Marković ,&nbsp;Damir Bosnar ,&nbsp;Ivana Tucaković","doi":"10.1016/j.radmeas.2024.107302","DOIUrl":"10.1016/j.radmeas.2024.107302","url":null,"abstract":"<div><div>This paper presents a detailed description of construction and introduction of an assembly for cosmic veto system at the Laboratory for radioecology of the Ruđer Bošković Institute in Zagreb. It is a typical surface laboratory for environmental radioactivity measurements using HPGe detectors. In surface level laboratories a large part of the background signal is caused by radiation produced by cosmic radiation, mostly by muons. It leads to limiting factors for reaching low detection limits, essential in environmental sample measurements, where relatively low activity concentrations are expected. Thus, reduction of cosmic component of background becomes a requirement, but also a challenge and an expense for already set routine gamma spectrometric laboratories. This paper offers a detailed description of materials and steps needed for construction and implementation of such an assembly as a guideline for other laboratories. The homebuilt veto system presented here is based on large scintillator plates covering the existing passive lead shielding. For the easy and rapid characterization of the veto system, a newly acquired digitizer was used. More specifically, the timestamping capabilities of the CAEN DT5781 MCA were used to identify the coincidences caused by muons between the scintillators and the HPGe. With the 3 plates added, a reduction factor of 2.4 was achieved, reducing the count rate between 40 keV and 2700 keV from 0.58 cps to 0.27 cps. After the full characterization of the veto system, the setup was transferred back to the previously used Canberra DSA, more suitable for routine measurements. This step and its description are lacking in the existing literature, while it is very valuable for the laboratories already set up for the environmental measurement. The additional advantages of a homebuilt system are the modularity and multi-purpose of the system which can later be used for different applications.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107302"},"PeriodicalIF":1.6,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single-photon elimination in liquid scintillation counting with pulse shape discrimination and delayed coincidence 利用脉冲形状判别和延迟重合在液体闪烁计数中消除单光子
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-20 DOI: 10.1016/j.radmeas.2024.107299
Pengpeng Zhang , Deyuan Li , Hui Li , Hui Zhang , Xuanru Zhang , Yan Ma , Linjing Wang , Hua Li , Xuewen Yan
{"title":"Single-photon elimination in liquid scintillation counting with pulse shape discrimination and delayed coincidence","authors":"Pengpeng Zhang ,&nbsp;Deyuan Li ,&nbsp;Hui Li ,&nbsp;Hui Zhang ,&nbsp;Xuanru Zhang ,&nbsp;Yan Ma ,&nbsp;Linjing Wang ,&nbsp;Hua Li ,&nbsp;Xuewen Yan","doi":"10.1016/j.radmeas.2024.107299","DOIUrl":"10.1016/j.radmeas.2024.107299","url":null,"abstract":"<div><div>Liquid scintillation counting is widely used in the rapid measurement of beta activity in environmental and biological samples. However, the single-photons generated by chemiluminescence and photoluminescence in liquid scintillation cocktails seriously affect the measurement accuracy of low-energy beta activity. A novel method based on the combination of the signal characteristic analysis and selective gate to eliminate the single-photon signal was developed. A preprocessing circuit made of a fast response time photomultiplier tube (PMT, Hamamatsu R9420), two charge-sensitive preamplifiers (CSP), two comparators, an analog switch and delay-line devices were designed and developed to verify the feasibility and effectiveness. The output signals from the last dynode were characterized in the pulse time and were used to discriminate the beta signals from the single-photon ones. The beta signals were “tagged” through pulse width detection, pulse width-amplitude transform and pulse-height discrimination with the first comparator, the first CSP and the second comparator. The “tagged” beta signal were applied to control the analog switch. The anode signals were specially delayed and then selected by the analog switch to achieve the single-photon signal elimination. Liquid scintillation cocktails containing <span><math><mrow><msup><mrow></mrow><mrow><mn>14</mn></mrow></msup><mi>C</mi></mrow></math></span> or NaOH used as beta or single-photon sources were provided to verify the feasibility of the principle. The results showed that the typical fall time of the single-photon and beta signal was 16.05<!--> <!-->ns and 43.17<!--> <!-->ns. The single-photon rejection ratio is 2.76 × 10<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></math></span> ± 3.89 × 10<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>5</mn></mrow></msup></math></span>, and the detection efficiency is up to <span><math><mrow><mn>93</mn><mo>.</mo><mn>02</mn><mtext>%</mtext><mo>±</mo><mn>0</mn><mo>.</mo><mn>59</mn><mtext>%</mtext></mrow></math></span>.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107299"},"PeriodicalIF":1.6,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3D printed microcrystalline CsI:Tl composite scintillating thin films for X-ray imaging 用于 X 射线成像的 3D 打印微晶 CsI:Tl 复合闪烁薄膜
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-19 DOI: 10.1016/j.radmeas.2024.107301
Divya Pandya , Nisha Oad , Sheetal Rawat , Brijesh Tripathi , Pavan Gurrala , Partha Sarathi Sarkar , Mohit Tyagi , Apoorva Bhatt
{"title":"3D printed microcrystalline CsI:Tl composite scintillating thin films for X-ray imaging","authors":"Divya Pandya ,&nbsp;Nisha Oad ,&nbsp;Sheetal Rawat ,&nbsp;Brijesh Tripathi ,&nbsp;Pavan Gurrala ,&nbsp;Partha Sarathi Sarkar ,&nbsp;Mohit Tyagi ,&nbsp;Apoorva Bhatt","doi":"10.1016/j.radmeas.2024.107301","DOIUrl":"10.1016/j.radmeas.2024.107301","url":null,"abstract":"<div><div>The utilization of additive manufacturing techniques, especially Digital Light Printing (DLP), in fabricating CsI:Tl scintillator films demonstrates considerable potential for streamlining the production of scintillators tailored for X-ray imaging applications. This research focuses on the fabrication of CsI:Tl-based composite plastic scintillator thin films. In this study, circular films measuring 1-inch in diameter and 0.1 mm &amp; 0.2 mm in thickness are being produced and tested for gamma photon counts under alpha and gamma radiation. To establish the stopping power range of the films, a Monte Carlo based GEANT4 simulation has been carried out. Additionally, investigations into their suitability for X-ray imaging applications are being conducted, revealing the spatial resolution of the films (0.2 and 0.1 mm) between 100 and 130 μm and 1.26 lp/mm with a contrast range of 4.0–12.3 %. The observed decrease in spatial resolution and contrast for the 0.2 mm thick film is attributed to the thickness increase exacerbating the scattering phenomenon while simultaneously enhancing the X-ray stopping power. This highlights the significance of inherent trade-off between maximizing spatial resolution and compromising light yield of 0.1 mm films compared to the 0.2 mm thick film. By utilizing 3D printing, this approach offers a cost-effective and time-efficient method for producing thin-film scintillators with enhanced flexibility and customization options compared to conventional methods.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107301"},"PeriodicalIF":1.6,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of thermoluminescence characteristics of quartz for high radiation doses (>1kGy): Implications for extending the luminescence dating range 高辐射剂量(>1kGy)石英热发光特性研究:对扩大发光测年范围的影响
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-18 DOI: 10.1016/j.radmeas.2024.107300
Malika Singhal , Madhusmita Panda , S.H. Shinde , Sandip Mondal , O. Annalakshmi , Naveen Chauhan
{"title":"Study of thermoluminescence characteristics of quartz for high radiation doses (>1kGy): Implications for extending the luminescence dating range","authors":"Malika Singhal ,&nbsp;Madhusmita Panda ,&nbsp;S.H. Shinde ,&nbsp;Sandip Mondal ,&nbsp;O. Annalakshmi ,&nbsp;Naveen Chauhan","doi":"10.1016/j.radmeas.2024.107300","DOIUrl":"10.1016/j.radmeas.2024.107300","url":null,"abstract":"<div><div>Quartz is an omnipresent abundant natural mineral, used for luminescence dating. Lately, quartz optically stimulated luminescence (OSL) technique is widely used to estimate the equivalent doses (D<sub>e</sub>) for dating geological events (up to 250 Gy, limited by saturation). Some works report thermoluminescence (TL) saturation around ∼ (10–40) kGy. Still dose estimates for such high radiation dose (HRD) range are not achieved. Significant research exists about luminescence response for low dose ranges (&lt;250 Gy) but limited studies are done for HRDs (&gt;1 kGy). This work characterizes the luminescence response of quartz for HRDs (1–21 kGy) to improve existing understanding of luminescence mechanism. Results show that the characteristics of the trap (&lt;200 °C) differ significantly at HRDs than low doses. TL in multi-spectral detection (UV–Visible) band suggest an increase in 340–380 °C peak intensity up to 11 kGy dose. The measurements of saturation dose suggest that it depends on the trapping centres but is independent of recombination centres for the samples used for study. The traps are found bleachable by sunlight, reducing TL signal to residual levels in 1 h. Further, the bleachability is found to be anti-correlated with luminescence emission wavelength. At HRDs luminescence sensitivity is influenced by dose given in previous cycle which is difficult to correct by routine normalization procedures. The work also explores the various normalization methods to find appropriate method for HRD estimation and recommends the use of mass normalization as other normalization methods do not correct the sensitivity changes at HRDs adequately.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107300"},"PeriodicalIF":1.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microdosimetry for BNCT: First measurements at different site sizes 用于 BNCT 的显微模拟技术:不同部位尺寸的首次测量
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-14 DOI: 10.1016/j.radmeas.2024.107298
A. Selva, A. Bianchi, L. Bellan, E. Fagotti, A. Pisent, V. Conte
{"title":"Microdosimetry for BNCT: First measurements at different site sizes","authors":"A. Selva,&nbsp;A. Bianchi,&nbsp;L. Bellan,&nbsp;E. Fagotti,&nbsp;A. Pisent,&nbsp;V. Conte","doi":"10.1016/j.radmeas.2024.107298","DOIUrl":"10.1016/j.radmeas.2024.107298","url":null,"abstract":"<div><p>Microdosimetric techniques are a valuable tool for beam quality monitoring in BNCT, due to their capability to distinguish different contributions to the total dose and provide physics-based quantities related to biological effectiveness of this composite radiation field. To this aim, measurements are generally performed with gas detectors simulating a tissue-equivalent site size between 0.5 and 2 μm. This work presents instead measurements for site sizes up to 10 μm, performed in the thermal neutron field produced by the accelerator-based MUNES source available at INFN-LNL. An avalanche-confinement TEPC with boron doping in the cathode walls was used. Photon and neutron dose fractions were discriminated in the measured dose-weighted distributions based on their different lineal energy range. In the neutron component two separate peaks could be distinguished for site sizes of 5 μm and greater, the origin of which was tentatively related to contributions due to protons and alpha particles. These results allow to assess the impact of increasing site diameter on the measured relative dose contributions and provide valuable reference data for biological modelling and for comparison with solid-state microdosimeters.</p></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107298"},"PeriodicalIF":1.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1350448724002464/pdfft?md5=535643b76f5e2020bc1cf807d6b27be3&pid=1-s2.0-S1350448724002464-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142242935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of a Machine Learning based method to detect anomalous Thermoluminescence Glow Curves (TL-GC) in routine Dosimetry Services 在常规剂量测定服务中使用基于机器学习的方法检测异常热释光辉光曲线 (TL-GC)
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107293
O. Arquero , J. Berenguer-Antequera , J.F. Benavente
{"title":"Use of a Machine Learning based method to detect anomalous Thermoluminescence Glow Curves (TL-GC) in routine Dosimetry Services","authors":"O. Arquero ,&nbsp;J. Berenguer-Antequera ,&nbsp;J.F. Benavente","doi":"10.1016/j.radmeas.2024.107293","DOIUrl":"10.1016/j.radmeas.2024.107293","url":null,"abstract":"<div><p>This contribution describes the development of a set of numerical methods based on Machine Learning algorithms to generate an automated classification of experimental Thermoluminescence (TL) Glow Curves obtained routinely by Dosimetry Services. This classification will use experimental data historically recorded by Thermoluminescence Dosimeter (TLD) devices and will be based on the search for possible anomalies in the curves. The classifier tool will ease the labelling of experimental data and the detection of anomalies without previous supervision, implying an improvement in the control evaluations in Quality Guarantee Systems often implemented by Dosimetry Services. Furthermore, this study shows that each curve provides information about the status of each dosimeter, and can be used to perform unsupervised classifications of the measurements.</p></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107293"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1350448724002415/pdfft?md5=274daa51c119ddba47ec86551634baa3&pid=1-s2.0-S1350448724002415-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142164742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermoluminescence properties of β-ray irradiated LuAGG:Ce nanophosphors prepared by sol-gel method for potential applications in dosimetry 溶胶-凝胶法制备的 β 射线辐照 LuAGG:Ce 纳米磷的热致发光特性在剂量测定中的潜在应用
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107296
S. Saadi , D.E. Kdib , A. Boukerika , R. Berreksi , A. Bentabet , S. Mahtout , Z. L Mokrani
{"title":"Thermoluminescence properties of β-ray irradiated LuAGG:Ce nanophosphors prepared by sol-gel method for potential applications in dosimetry","authors":"S. Saadi ,&nbsp;D.E. Kdib ,&nbsp;A. Boukerika ,&nbsp;R. Berreksi ,&nbsp;A. Bentabet ,&nbsp;S. Mahtout ,&nbsp;Z. L Mokrani","doi":"10.1016/j.radmeas.2024.107296","DOIUrl":"10.1016/j.radmeas.2024.107296","url":null,"abstract":"<div><p>In this paper, Lu<sub>2.97</sub>Al<sub>5–x</sub>Ga<sub>x</sub>O<sub>12</sub>:Ce<sub>0.03</sub> (x = 0, 1, 2, 3) nanophosphors were synthesized using sol-gel method and calcined at 1100 °C for 3 h. The effect of Ga content on the structural, photoluminescence (PL), and notably thermoluminescence (TL) glow curve, dose response, repeatability and fading properties were investigated. X-ray diffraction (XRD) results indicated that all synthesized samples were crystallized in a pure garnet phase. The PL emission spectra exhibited a broad emission band corresponding to the 5 d → 4f (<sup>2</sup>F<sub>5/2</sub>, <sup>2</sup>F<sub>7/2</sub>) transition of Ce<sup>3+</sup> ions in the garnet lattice. Furthermore, a significant decrease in emission intensity was observed upon increasing Ga content. The TL characteristics of nanopowders irradiated with β-rays revealed a significant effect of Ga content on the peak position, shape and intensities of TL Glow curves, which can be explained by the reduction of the energy gap and the distribution of trap levels. The dose response linearity in the range of 0.125–100 Gy was examined for different Ga content, revealing a good linear behavior for x = 0 and 1 Ga. Additionally, samples prepared with x = 0, 1, and 2 Ga exhibited a high level of repeatability across a batch of 10 samples. Also, fading studies were performed for 128 h and revealed strong fading in samples synthesized with x = 0 and 1 Ga. These results suggest potential applications of Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce and Lu<sub>3</sub>Al<sub>4</sub>Ga<sub>1</sub>O<sub>12</sub>:Ce in ionizing radiation dosimetry.</p></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107296"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Significance and feasibility of air kerma length product and air kerma area product comparisons 空气气膜长度乘积和空气气膜面积乘积比较的意义和可行性
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107291
Miloš Živanović , Maja Vojnić Kortmiš , Nikola Kržanović , Miloš Đaletić , Ivana Komatina
{"title":"Significance and feasibility of air kerma length product and air kerma area product comparisons","authors":"Miloš Živanović ,&nbsp;Maja Vojnić Kortmiš ,&nbsp;Nikola Kržanović ,&nbsp;Miloš Đaletić ,&nbsp;Ivana Komatina","doi":"10.1016/j.radmeas.2024.107291","DOIUrl":"10.1016/j.radmeas.2024.107291","url":null,"abstract":"<div><p>Air kerma length product and air kerma area product are special quantities used in diagnostic radiology. They are measured using special measurement devices – CT-chambers and KAP-meters, in order to calculate quantities related to patient exposure. Appropriate calibration of all measurement devices is of vital importance, and comparisons between calibration laboratories are necessary to prove competence.</p><p>It is usually considered adequate to participate in air kerma comparisons to prove capabilities for special quantities, but the literature shows that some problems in calibration procedure can remain unknown. The comparisons directly in terms of special quantities provide additional burden to laboratories, and require special transfer instruments, but they allow checking the whole calibration procedures.</p><p>This paper describes a comparison between two calibration laboratories in terms of both air kerma length product and air kerma area product. Both laboratories achieved good results for all radiation qualities, considering the measurement uncertainty. Transfer instruments’ linearity, field size dependence and energy dependence were investigated. Even though the metrological properties of the transfer instruments are worse than the ionization chambers, they can be taken into account by introducing additional measurement uncertainty, performing appropriate corrections or choosing calibration points for the comparison for the values of influence quantities where the transfer instrument response is relatively flat. These comparisons provide additional value to calibration laboratories, but there are still several challenges related to their organization and execution.</p></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107291"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
International intercomparison and quality assessment of passive and active 222Rn measuring devices in the Asia-Pacific region 亚太地区无源和有源 222Rn 测量装置的国际互比和质量评估
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107295
N. Karunakara , A.P. Vijith , Rosaline Mishra , B.K. Sahoo , Miroslaw Janik , Sudeep Kumara , B.K. Sapra , Shinji Tokonami , Chutima Kranrod , S. Chandrasekaran , N. Chitra , Seon hong Kim , Juhee Yoo , Chao Zhao , Bo Chen , Hong-Gi Kim , Jin-il Kim , Josef Holecek , Le Dinh Cuong
{"title":"International intercomparison and quality assessment of passive and active 222Rn measuring devices in the Asia-Pacific region","authors":"N. Karunakara ,&nbsp;A.P. Vijith ,&nbsp;Rosaline Mishra ,&nbsp;B.K. Sahoo ,&nbsp;Miroslaw Janik ,&nbsp;Sudeep Kumara ,&nbsp;B.K. Sapra ,&nbsp;Shinji Tokonami ,&nbsp;Chutima Kranrod ,&nbsp;S. Chandrasekaran ,&nbsp;N. Chitra ,&nbsp;Seon hong Kim ,&nbsp;Juhee Yoo ,&nbsp;Chao Zhao ,&nbsp;Bo Chen ,&nbsp;Hong-Gi Kim ,&nbsp;Jin-il Kim ,&nbsp;Josef Holecek ,&nbsp;Le Dinh Cuong","doi":"10.1016/j.radmeas.2024.107295","DOIUrl":"10.1016/j.radmeas.2024.107295","url":null,"abstract":"<div><p>Intercomparison exercise is an integral part of the quality assurance programmes in <sup>222</sup>Rn measurements using active and passive devices. Ensuring the accuracy of data generated through measurements necessitates periodic performance checks. To achieve harmonization of methods, quantify biases and errors in measurements, and identify the reasons for discrepancies, there is a pressing need for periodic intercomparison exercises. To address this need of numerous laboratories, particularly in the Asia-Pacific region, a calibration facility for <sup>222</sup>Rn measuring devices has been established at the Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, India. An international intercomparison exercise for the <sup>222</sup>Rn measuring devices was conducted at this facility in the year 2022 with the participation of 10 laboratories from six countries. A total of 354 devices (comprising of both active and passive detectors) were subjected to intercomparison measurements by exposing them to three concentration levels: (5.97 ± 0.29) × 10<sup>3</sup> Bq m<sup>−3</sup>, (0.70 ± 0.09) × 10<sup>3</sup> Bq m<sup>−3</sup> and (2.02 ± 0.20) × 10<sup>3</sup> Bq m<sup>−3</sup> in separate experiments and the exposure durations were 7 days, 15 days, and 10 days respectively. The performance of each laboratory was evaluated following the criterion adopted by the International Atomic Energy Agency (IAEA) in its worldwide proficiency test programmes. This exercise brought out the fact that some of the laboratories need to improve their measurement practices to produce reliable data.</p></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"178 ","pages":"Article 107295"},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the effects of preparation processes on OSL and TL properties of NaMgF3:Dy,Eu 制备工艺对 NaMgF3:Dy,Eu 的光致发光(OSL)和热致发光(TL)特性的影响研究
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2024-09-10 DOI: 10.1016/j.radmeas.2024.107297
Siyuan Zhang, Kaiyong Tang, Li Fu, Mo Zhou, Haijun Fan, Yan Zeng, Zhiyuan Li
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